but i adjust the velocity adjuster in and out but the problem is first shoot 320 fps next 300 next 320 next 140 fps next 145 fps next 320 fps next back to 140 and i have tested diffrent air bottles diffrent bolt ( i have 5 other mr 1 no problem they all shoot about 300 fps all the time) and i cant se any leaks or hear .

With your velocity issues, it is in your methods in adjusting most likely judging by your numbers. You need to fire 5 shots to reset the springs in order to get accurate chronograph readings. Adjust in a quarter turn at a time until you hit 300fps, then decrease it (take it out) an eighth of a turn and see where you're at. If you're hitting 280fps, drop it another 1/16th of a turn. You want to get the marker so that when it's adjusted it will hit a MAX of the field's velocity limit. The marker when in it's stock form with CO2 can spike, and you don't want it set so that when it does spike it destroys someone's equipment (more specifically, their goggle lens).

today i shoot 20 rounds with the velocity adjusted max in and 20 shoot haflway out and another 20 when velocity adjusted max out i have changed all the 0 rings and a stiffer spring and now the crono says about 150 fps 152 fps 151 fps ok but to low speed